Irwin record chain wrenchs are robust and provide maximum grip on round or irregular shapes not for use on copper pipe or non ferrous pipes easy to use you simply loop the chain around the pipe lock it and the jaws will grip in the direction of turn great for use in confined spaces trenches or close to walls with its double ended reversible replacement jaws and a high breaking strain tensile steel chain with fast positive lock the cast tubing handle combining strength and lightness note not for